RFID smart bookshelf anti-signal interference and cross-zone reading solution
chrispeng [ad_1]
Smart Shelf and RFID
Smart Shelf (Smart Shelf) has a long-standing demand for logistics and asset management. Previously, manufacturers installed counters with small LCD screens on each storage position of the shelf. When the staff removed the object from the storage position, Enter the number of withdrawals on the counter of the storage location to record the remaining total. This method is indeed easier to use than the earlier only storage system software without any technical aids, but when the number of warehousing and shipments is large At that time, it will cause a burden on the warehouse staff, and may cause record errors due to human negligence.
Smart Shelf using RFID (Note 1), when built on a large scale, due to the close deployment of RFID antennas, RF signals may interfere with each other and cross-area reading, even if software calculations are used Technically, it is also difficult to overcome, so some manufacturers want to add shielding signals to deal with it. It can indeed solve some of the problems initially, but because of different types of storage objects, the size and type of shelves are different. Therefore, the method of shielding the signal has to be changed. Then try to think about how much trouble it will bring and the cost of planning and construction when it is built on a large scale.
Polling mode transmission to avoid mutual interference of RF signals
In order to avoid RF signals from interfering with each other, the polling method is adopted to transmit the signals, and the same frequency signals are not transmitted at the same time, so they will not interfere with each other’s reading. In order to avoid cross-zone reading, the built-in hardware shielding signal method is adopted , So as not to read the data of the electronic label outside the area.
The author’s R&D team (Note 2) has overcome the problems of RF signal interference and cross-area reading, and has applied for patents in the United States, Taiwan and China. This solution can reduce the cost of hardware electronic components and institutional materials, as well as on-site engineering erection. The construction time of personnel, and easy follow-up maintenance, hereby briefly describe the technical content for you advanced.
In a reading unit composed of at least two sets of RF drive modules and shielded drive modules connected in parallel to the same reader, the RF drive module is a unit that allows the antenna coil to work, and the shielded drive module is a set of coils that allow the antenna to be The effect produced by the unit that is shielded, each RF drive module and shield drive module are connected to an output device, each output device and reader are connected to a microprocessor, and each output within the range of the same group of readers The devices are controlled by a microprocessor, allowing only one group of RF drive modules to be driven at the same time, and the other groups are all used for shielding drive modules; and each unit group is processed by the microprocessor in sequence (as shown in Figure 1 Shown).
620)this.style.width=620;” border=0>
Figure 1. Each reading unit group is processed sequentially by the microprocessor
In the process of reading data, the data is transferred from the electronic tag on the object to the reader through the antenna coil, and the shielding coil is activated at the same time to perform the shielding function (as shown in Figure 2).
620)this.style.width=620;” border=0>
Figure 2. The shielding function is played by activating the shielding coil
Use multitaskers to reduce the cost of hardware, electronic components and mechanism materials
In order to reduce the cost of hardware electronic components and mechanism materials, and in the pursuit of green energy saving and environmental protection, multitaskers are used to transmit power, reduce the direct transmission power of the reader, and reduce energy consumption (as shown in Figure 3).
620)this.style.width=620;” border=0>
Figure 3. Use a multitasker to reduce the direct transmission power of the reader
Since the shielding function has been integrated into the system, there is no need to face a huge external shielding signal device when it is built.
Concluding remarks
Smart periodical racks and smart bookshelves made through RFID technology can strengthen the dynamic control mechanism of book management. Readers can check the location and borrowing status of periodicals and books online, and librarians can check errors through the system. Librarians only need to follow the instructions of the system and put them back in the correct shelf positions. Librarians can also take inventory at any time. The inventory does not require manpower and time. The system will automatically perform statistical analysis on the inventory data. Librarians do effective processing. In addition, librarians can also use systematic periodicals click-through statistical analysis reports to eliminate paper periodicals with a low number of clicks and purchase other periodicals, so that the funds for the purchase of periodicals can be effectively used.
Remark:
1. RFID (Radio Frequency Identification) radio frequency identification, in a narrow sense, it includes a reader (Reader) and electronic tags (Tag), readers and electronic tags use radio waves to make data transfer. Under the selection of the appropriate RFID frequency band and technology, even if there is paper, glass, wood or even water between the reader and the electronic tag, the signal can penetrate, achieving the purpose of transmitting data between the reader and the electronic tag. And most types of electronic tags contain read and write memory, which can write data in real time, so it can be used in a wider range than traditional barcodes.
2. Jiliante Technology has been promoting RFID in the market since 2000. There are customers in Taiwan, the mainland and Northeast Asia. The engineering unit has accumulated considerable technical energy, and has also obtained the international CompTIA RFID+ technical certification, laying the foundation for radio frequency The design basis of the management device.
[ad_2]
